<s>
The	O
pattern	O
sent	O
is	O
12	O
bits	O
long	O
,	O
so	O
every	O
group	O
of	O
12	O
frames	B-Protocol
is	O
called	O
a	O
superframe	O
.	O
</s>
<s>
Each	O
channel	O
sends	O
two	O
bits	O
of	O
call	O
supervision	O
data	O
during	O
each	O
superframe	O
using	O
robbed-bit	O
signaling	O
during	O
frames	B-Protocol
6	O
and	O
12	O
of	O
the	O
superframe	O
.	O
</s>
<s>
It	O
is	O
preferred	O
to	O
its	O
predecessor	O
,	O
superframe	O
,	O
because	O
it	O
includes	O
a	O
cyclic	O
redundancy	O
check	O
(	O
CRC	O
)	O
and	O
4000bit/s	O
channel	O
capacity	O
for	O
a	O
data	O
link	O
channel	O
(	O
used	O
to	O
pass	O
out-of-band	B-Protocol
data	I-Protocol
between	O
equipment	O
.	O
)	O
</s>
<s>
An	O
extended	O
superframe	O
is	O
24	O
frames	B-Protocol
long	O
,	O
and	O
the	O
framing	O
bit	O
of	O
each	O
frame	O
is	O
used	O
in	O
the	O
following	O
manner	O
:	O
</s>
<s>
All	O
odd-numbered	O
frames	B-Protocol
(	O
1	O
,	O
3	O
,	O
...	O
,	O
23	O
)	O
are	O
used	O
for	O
the	O
data	O
link	O
(	O
totalling	O
4000	O
bits	O
per	O
second	O
)	O
,	O
</s>
<s>
Frames	B-Protocol
4	O
,	O
8	O
,	O
12	O
,	O
16	O
,	O
20	O
,	O
and	O
24	O
are	O
used	O
to	O
send	O
the	O
fixed	O
framing	O
pattern	O
,	O
001011	O
.	O
</s>
